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But no matter how much power the train has,但无论列车有多大动力it can never quite物理法则的限定reach the speed of light since the laws of physics forbid it.使它永远无法到达光速Instead, let#39;s say it gets close,但我们能假定它无限趋近于光速just shy of that ultimate speed.仅略微慢一些Now something extraordinary happens.神奇的事情就会发生Time starts flowing slowly on board relative to the rest of the world,相对于列车外,列车内的时间逐渐减慢just like near the black hole, only more so.就如同黑洞周围的情形,不过更慢Everything on the train is in slow motion.列车上的一切动作都缓慢下来This happens to protect the speed limit,这是为了维护速度极限and it#39;s not hard to see why.我们不难看出其中的原因Imagine a child running forwards up the train.试想一个孩子沿列车运行方向奔跑Her forward speed is added to the speed of the train,她的速度与列车速度相加so couldn#39;t she break the speed limit simply by accident?那她岂不是无意间就打破速度极限了吗The answer is no.是否定的The laws of nature prevent the possibility自然法则通过减慢列车内的时间by slowing down time on board.来防止这一可能的发生Now she can#39;t run fast enough to break the limit.这样她就不可能突破速度极限Time will always slow down just时间总是能够减慢enough to protect the speed limit.足以保护极限速度不被突破And from that fact comes the possibility of基于此,便产生了traveling large distances into the future.通过时间旅行穿梭至久远未来的无限可能Imagine the train left the station on January 1, 2050.假设列车2050年1月1日从站台出发It circles the earth over and over again for 100 years周而复始地环绕地球100年before finally coming to a halt on New Year#39;s Day, 2150.最后在2150年元旦停下来The passengers will have only lived one week because此时列车上的旅客仅度过了1周time is slowed down that much inside the train.因为列车内的时间被减缓了When they got out,当他们走出列车they#39;d find a very different world than the one they#39;d left.会发现世界发生了天翻地覆的变化In one week, they#39;d have traveled 100 years into the future.一周内,他们穿越到了未来100年 Article/201507/389292China to introduce HIV NAT method nationwide in 2015中国将在2015年全国范围内引入艾滋病NAT检测法A nucleic acid test, often called NAT, is a molecular technique used to detect a virus.NAT核酸检测是一种用于检测病毒的分子生物学技术。HIV nucleic acid testing is so far the most efficient way to test for the AIDS virus during its window period.目前为止艾滋病病毒核酸检测是艾滋病窗口期最为有效的测试方法。In September 2014, China tested some 12 million blood samples using the NAT method. 2014年9月中国使用该种方法对约1200万血液样本进行了检测。Over 14 thousand were HIV positive, including 76 cases that were detected in its window period. 其中超过14000人艾滋病病毒呈阳性,而其中76例是在艾滋病窗口期经检测发现。However, the technique has so far only been adopted in some large and medium-sized cities.然而这项技术目前只在一些大中型城市采用。By September 2014, 26 provincial level regions in China began using NAT tests. 到2014年9月,我国有26个省级地区级开始使用NAT检测法。As instructed by Premier Li Keqiang, NAT tests will be introduced to all blood banks across China by the end of 2015. 而李克强总理指示到2015年底这种检测法将普及到全国各地所有的血库。The project will be funded by the government.政府将对该项目进行资助。 Article/201501/354542Foot Idioms有关“脚丫子”的实用成语Hello, I#39;m a very interesting and intelligent man. And today, these feet—ugh!—and I will be teaching you some English idioms. I bet you#39;ve never been taught by some feet before.哈萝,我是个非常风趣又聪明的男人。今天,这些脚--恶!--还有我要来教你一些英文成语。我敢说你从没被脚教过。Ahh...the world! One day, I#39;d like to visit the world. You see, I haven#39;t left this room since... Actually, I#39;ve never left this room. Oh, but I#39;d love to travel! Ahhhh!!! That#39;s right! I#39;ve got itchy feet. In English, if you have a strong feeling that you#39;d like to travel, we say, ;I#39;ve got itchy feet.; I#39;ve got itchy feet. Well, maybe I should wash them more often.啊...世界!有朝一日,我要去看看这世界。你知道,我从没离开过这间房间,自从... 事实上,我从没离开过这间房间。噢,但我很乐意去旅行!啊啊啊啊!!!没错!我好想去旅行啊。英文中,如果你有想去旅行的强烈渴望,我们会说:“我好想去旅行。”我脚好痒好想去旅行。这个嘛,也许我应该要更常洗脚。I did try to leave this room once. I planned to visit my dream country—Belgium! But, I suddenly became too frightened to do it. That#39;s right. I got cold feet. In English, if we make a plan but then decide not to do it because we are too nervous, we say, ;I got cold feet.; I got cold feet. Well, perhaps I should buy some socks.我是有试过一次要离开这房间。我计划要去拜访我的梦想国度--比利时!不过,我突然怕到不敢去实践。没错。我退缩了。英文中,如果我们订了个计划但后来因为太紧张而决定不去做,我们会说:“我退缩了。”我脚冻僵动不了。嗯,或许我该买些袜子。Okay, friends, a word of advice: Never play with guns! Ahhh!!! Otherwise, you could shoot yourself in the foot! In English, if you do something that ruins a situation for you, we say, ;I shot myself in the foot.; I shot myself in the foot. Like that time I ran a marathon. Instead of drinking water, I drank beer! I was completely useless! I could hardly run in a straight line!好了,朋友们,一个忠告:不要玩!啊啊啊啊!!!不然的话,你有可能会拿石头砸自己脚!英文中,如果你做了件替自己找麻烦的事,我们说:“我拿石头砸自己脚。”我拿石头砸自己脚。就像那次我跑马拉松。我不是喝水,我喝了啤酒!我整个人超逊的!我几乎没办法跑直线!Hang on! Hey, hey, wait for me! Wait, come back! Come back! Come back! I#39;ll wait for ya... I#39;ll... I#39;ll...等等啊!嘿、嘿,等等我啊!等一下,回来!回来!回来!我会等你... 我会... 我会... Article/201511/408170The educated materials presented here这里展示的教学材料were developed by students and faculty of由爱荷华州立大学the Department of Food Science and Human Nutrition食品科学及人类营养学系的at Iowa State University.学生和老师完成Funding for this project was provided此项目由美国癌症协会-中西部by grants from the American Cancer Society-和兰斯阿姆斯特朗基金会Midwest and the Lance Armstrong Foundation.赞助持The materials are intended for educational use and此材料仅作教学使用are not meant to provide medical advice.并非提供医疗建议We welcome your feedback about these materials.我们希望课后能收到你们的反馈Please use the evaluation survey link on the homepage请通过主页上的评估调查链接to provide your comments and suggestions.给我们提供评价和建议The topic this presentation will discuss is new trends这次报告的话题将围绕癌症预防的新趋势in cancer prevention. In particular it will focus on展开 这次我们会特别集中讨论the effects of soy and acai berry on cancer risk.大豆和巴西莓对于癌症患病几率的影响To get started think about this question:首先想想这个问题do you think consuming soy products will increase你认为食用豆制品会增加or decrease an individual#39;s risk of cancer?或降低一个人患癌症的几率吗Soy is considered to be both a bean and a legume大豆被认为既是豆又是荚and can be eaten in many different forms.有很多种不同的吃法Whole soy beans can be toasted or cooked全大豆可以烤着吃like any other bean.也可以用和其他豆类一样的做法吃One common preparation technique used in Asian在亚洲国家一种常见的烹饪技巧countries is to boil them in salt water.是在盐水中煮它们This is referred to as edamame.这种做法叫做盐煮毛豆Soy can also be ground into flour and substituted大豆还可以磨成粉in recipes for all purpose flour.在食谱中代替通用面粉Many processed products also contain soy such as很多加工食品也含有大豆soymilk, cheeses, yogurts, and soybean oil.如豆浆 奶酪 酸奶 和大豆油Other soy products include tofu which is made from其他豆制品包括豆浆做成的豆腐soymilk, miso which is a paste made from soybeans大豆做成的糊状的味噌and tempeh which is made from whole soybeans.还有全大豆做成的印尼豆豉The nutritional content of soy products varies greatly豆制品的营养成分会由于多种因素depending on many factors.而有很大差别For example, much of the soy in US products is processed比如 美国食品里的大豆大多都加工过thus its nutritional composition changes from that of因而它的营养组成unprocessed soybeans.与未加工的大豆不同Overall soy is a good source of protein with about 40%全大豆是很好的蛋白质来源of its total calories coming from protein.它所有卡路里中的40%都来自蛋白质It is also a great substitute for meat in vegetarian它也是素食中很好的肉的替代品diets because it contains all the essential amino由于它含有人体所需却又无法acids that the body needs yet cannot produce自行合成的所有必需氨基酸which defines soy as a complete protein.因此大豆也被誉为完全蛋白质Soy products are also typically high in fiber,豆制品还有很高含量的纤维B vitamins, calcium, iron and the good fats,维生素B 钙 铁 以及优质脂肪omega 3 and omega 6 fatty acids.n-3和n-6脂肪酸It is also low in saturated fat.豆制品的饱和脂肪含量很低It is important to note however that nutritional但要注意的重要一点是composition of soy depends on what other ingredients大豆的营养组成取决于最终产品are included in the final food product.含有什么其他成分There are a couple of key reasons that soy is being多种原因造成了近年来researched so heavily in recent years.急剧升温的大豆研究热 Article/201507/386149

Rare Video: Japan Tsunami勿忘 311 海啸的痛All across northern Japan, they felt it—a violent, magnitude 9.0 earthquake on March 11, 2011. It was centered about 80 miles offshore, and tsunami warnings went up immediately. In coastal cities, people knew what to do next: run to higher ground.整个北日本地区,他们感受到它--2011 年 3 月 11 日一阵剧烈、震度 9.0 的地震。震央在近海约 80 里 (约 129 公里) 处,海啸警报立刻发布。在沿海城市,人们知道接下来要做什么:逃到高处。It#39;s from these vantage points on hills and in tall buildings that incredible footage was captured. In Kesennuma, people retreated to a high-rise rooftop and could only watch in horror as tsunami waves inundated their city, knocking buildings into rubble and mixing into a kind of tsunami soup filled with vehicles, building parts, and contents. Seawater cascaded over seawalls and into cities.正是从小山上和高耸建物中的这些有利位置,惊人的影片被拍下。在气仙沼市,人们退到高楼屋顶上,但在海啸浪潮淹没他们的城市时只能惊恐地看着,海啸将房屋击碎成瓦砾堆,搅拌成一种混着汽车、房屋零件和内容物的海啸汤。海水滚滚越过防波堤然后进入城市。This shows the water rushing over an 18-foot seawall in the Kamaishi city. The seawall here was the world#39;s deepest and largest, but not enough for the magnitude of the March 11 disaster. It was the largest quake ever known in Japan, and one of the five largest recorded in the world. More than 28,000 people are confirmed dead or missing.这个影片播放出海水冲过一面在釜石市 18 英尺高 (约 5.5 公尺) 的防波堤。这里的防波堤是世界上最深最大的,但不足以应付 3 月 11 号那灾难的强度。这是日本有史以来所知最大的地震,也是全世界记录五个最大的地震之一。超过两万八千人被确认死亡或失踪。When two tectonic plates push together under the sea, the resulting earthquake sends an enormous burst of energy up through the ocean, displacing enormous quantities of water. With the upward motion, a series of waves expands in all directions.当两个板块在海底推挤在一起时,产生的地震将一个巨大的能量爆发向上穿透海洋传送出去,排出大量的水。随着那向上的移动,一连串的海浪向四面八方扩散。In deep water, these waves travel fast—up to 500 miles an hour—but only reach a height of a few feet. A passing ship might not even notice. But as the waves enter shallow waters, friction with the ocean floor lowers the waves#39; speed, but raises their height.在深海域,这些海浪移动得很快--高达时速 500 英里 ( 约 805 公里)--但只达到几英尺的高度。一艘经过的船可能甚至不会注意到。但当海浪进入浅海域,和海床的擦减慢海浪速度,但提升了海浪的高度。This is from a Japan coast guard ship confronting a tsunami wave in shallow water on March 11. And a rare view from the air— of a tsunami wave approaching the shoreline. In Japan, some tsunami waves reached as far as three miles inland. Japan may be the most seismologically-studied country in the world, and with more than 1,200 high-precision GPS stations, a geophysicist at the University of Alaska used the data to create a visualization of the March 11 quake. The waves of displacement that you see were moving as fast as five miles per second. In this photo, the ripples of tsunami waves are seen moving upstream in the Naka River at Hitachinaka City.这个影片是来自一艘 3 月 11 日在浅海域遇到一波海啸浪潮的日本海巡船。还有一个空拍的罕见景象--一波海啸浪潮渐渐接近海岸线的影片。在日本,一些海啸浪潮到达内陆三英里 (约 5 公里)的距离。日本可能是全世界地震学上最被研究的国家,有着超过 1,200 个高度精确的 GPS 站点,阿拉斯加大学的一位地球物理学家利用那数据来建立出 3 月 11 日地震的想像图。你所见板块位移产生的波动正达到每秒五英里 (约 8 公里) 的速度在移动。这张相片里,海啸波浪的涟漪在常陆那珂市的那珂川中被观察到正向上游移动。New technology left an enormous amount of visual evidence for study in years to come, and can, perhaps, help us better understand the power of earthquakes and tsunamis, and prevent loss of life in the future.新科技留下大量可见据供未来的研究,且或许可以帮助我们更了解地震和海啸的力量,并在未来避免生命损失。 Article/201507/387764

They#39;re the first Romans to set foot In the Chinese capital, Luoyang.他们是在中国的首都洛阳落脚的 首批罗马人They#39;ve entered another world.Luoyang, China.他们进入了另一个世界 在中国洛阳Roman merchants 5,000 miles from Rome.罗马商人来到了离家五千英里外的地方They#39;ve come in search of silk.开始研究丝绸The Romans were obsessed with Chinese silk.罗马人迷恋上了中国的丝绸And they would cross oceans and cross lands in pursuit of these exotic foreign goods.他们愿意翻山越岭远跨重洋 前来寻找这些奇异的外国商品It#39;s not what they needed,but they were going after what they wanted.那不是他们生活的必需 却是其心之所向Romans spend the equivalent of .2 billion a year罗马每年约耗费等同于如今的22亿美元Importing luxuries like silk From Niddlemen in India and central Asia.用于从印度和中亚的商人手里 进口丝绸等奢侈品But they don#39;t know where silk comes from or how it#39;s made.但他们不知道丝绸的产地或制作工序They think it grows on trees.他们以为丝绸是长在树上的Silk manufacturing is a state secret in China.丝绸手工制造是中国的一个国家机密No Chinese weaver is to share that knowledge with a foreigner.没有哪个纺织者会告诉外国人其制造流程China knows the value of its silk as an export commodity.中国知道丝绸作为出口商品的价值It#39;s a secret China has guarded for 3,000 years.这是中国保守了三千年的秘密 Article/201510/404436

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